1. Medical staff will conduct arterial blood gas analysis to measure arterial blood oxygen partial pressure and oxygen saturation. According to the measurement results, medical staff will diagnose whether home oxygen therapy is needed, and conduct it under the correct guidance of medical staff.

　　2. Oxygen source: O2-8 and O2-88 oxygen machines are used as ideal oxygen sources.

　　3. Properly master the use of various oxygen inhalation tools. Generally, nasal congestion is used to inhale oxygen in the front nostril. The patient will feel more comfortable and light, and will not affect speech and eating.

　　4. Master the oxygen therapy time and oxygen flow: In order to obtain a better oxygen therapy effect, the oxygen inhalation flow should be 0.5~3 liters/min, and oxygen inhalation should be at least 15 hours a day. Do not shorten the oxygen inhalation time according to your symptoms. .

　　5. Cleaning and disinfection of oxygen inhalation tools: Use household cleaners to clean the nasal cannula, once a day, rinse with clean water and then let it dry. Clean the mixed gas humidification bottle with clean water once a day, and replace with cold boiled water and purified water. Or distilled water once a day, nasal cannula and gas mixing bottle are disinfected once a week.

　　6. Observe the effect of oxygen inhalation: If cyanosis is reduced or disappeared, breathing is slowed down and stable, heart rate slows down, blood oxygen partial pressure and oxygen saturation rise, the effect is good. On the contrary, it is necessary to consult medical staff for analysis and diagnosis.

　　7. Correctly record the oxygen therapy diary, oxygen therapy time, flow rate, and changes in the condition after oxygen therapy, to provide a basis for outpatient follow-up or to determine the treatment plan at the time of treatment. One week after the start of oxygen therapy, you should go to the hospital to recheck blood gas to understand the effect and existence of oxygen therapy If you have any problems, follow up once a month so that you can correct them in time.